The amount of biomass or organic matter produced per unit area over a time period by plant during photosynthesis is defined as:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Primary productivity
Option (2) Primary productivity — Correct. Primary productivity, the biomass made by plants per unit area per time.
NCERT Extract:
Productivity – “Primary production is defined as the amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis. It is expressed in terms of weight (g m–2) or energy (kcal m–2). The rate of biomass production is called productivity. It is expressed in terms of gm–2 yr –1 or (kcal m–2) yr–1 to compare the productivity of different ecosystems.”